Kohler 1.28 vs 1.6 GPF Toilets | Comparison

Finding the correct toilet for your space might be difficult because they all look to be the same. The differences may be detected when you take a close look at each single element, such as height, form, and flushing system because these are crucial features that distinguish a toilet from the rest.

The most prevalent aspect that distinguishes the toilet is the amount of water consumed in a single flush, with capacities ranging from 1.28 to 0.8 GPF. This equates to toilets utilizing 1.6 or 0.8 gallons of water every flush.

In fact, a toilet that consumes 1.6 to 1.28 GPF per flush can efficiently push down up to 900 grams of solid waste per one flush while saving water.

The goal of this post is to offer you with a detailed comparison of Kohler 1.28 versus 1.6 GPF toilets.

Share with you all of the critical information that every buyer should examine, such as functionality, durability, authentic customer reviews, and user experience.

1.28 vs 1.6 GPF Kohler Toilets: Product Review

Kohler K-3589-0 Elongated 1.6 GPF Toilet

The Kohler K-3589 is a two-piece toilet, with the elongated bowl providing comfort in the bathroom while using it. You will definitely enjoy the added space by this toilet making your experience more comfortable.

The height of this toilet makes the sitting and standing up an easy task for most of the adults as it offers the chair-height seating.

Despite the seat and supply line not included when purchasing the toilet, this toilet stands out.

The toilet is a combination of the Kohler-4309 bowl and the Kohler-4418 tank, and with adoption of Aquapiston technology the K-3589-0 makes sure the distribution of water is accurately distributed when one flushes the toilet.

Why we recommend this:

  • An elongated bowl providing comfort.
  • The right height making sitting and standing easy.
  • An efficient and effective flushing system.
  • Low consumption of water.

Kohler K-3609 – 1.28 GPF Cimarron Comfort Height Toilet

This toilet will offer you comfort with the elongated bowl adding more room on the toilet seat. The height of this toilet makes sitting and standing an easy task for adults with back problems.

With this toilet, you will save on water with the consumption of water standing at 1.28 gallons per flush.

The inclusion of the Aquapiston technology makes the flushing of the toilet effective and efficient cleaning the bowl completely.

A trip lever on the left-hand polished chrome is included making the whole process much easier for everybody.

Why we recommend this:

  • Low consumption of water at 1.28gpf.
  • Comfort with elongated bowl.
  • Aquapiston technology making the flushing system effective.
  • The right height of the toilet.

Comparison Table

Features Kohler 1.28 GFP
Kohler 1.6 GFP
Water Consumption: 1.28 Gallons Per Flush 1.6 Gallons Per Flush
Water-Saving: Yes No
Powerful Flush: No Yes
Flush type Gravity flush Gravity flush
Sound Quieter Quiet
Eco-Friendly: Yes No
Bowl: Smaller Larger
Space Saving: Yes No
Bowl After Flush: Clean Marginally Cleaner

 Final Verdict

The right toilet for you will do you justice and you will get value for your money. The Kohler brand is known to deliver the best regarding to quality, durability, and innovation.

These toilets by Kohler will grant you the best seating height making it easier for you to sit and get up. The rough-in measurements are to go for as they are suitable for your bathroom spaces.

The idea of the Aquapiston technology for the flushing system, let you use little water to have a clean bowl with a single flush.

The Kohler ensures they are compliant with the set standards by controlling the flow rate in a single flush maintained between 1.28 gallons per flush to 1.6 gallons per flush. You will worry less about your water bills at the end of the month.

Each particular toilet has its own drawbacks and advantages but expect the best from both of them.

You should be able to make your decision based on the features you would go for in a toilet ensuring your needs are met in the long run

Kohler Elongated 1.6 GPF Toilet

More powerful to flush heavier toilet waste in a single flush.”

KOHLER Cimarron 1.28 GPF Toilet

Environmental friendly toilet – saves more water per single flush up to 3000-4500 gallons of water per year.”

Purchasing the right toilet for your home should be the easiest task as you are aware of what you need from your toilet and what will work for you.

The features of these two toilets should let you know on what you are looking for to get the best toilet for your bathroom. The efficiency, the effectiveness, and the comfort offered by the toilet are some of the factors to consider when picking one.

The right toilet will be of much benefit to you and your family.

Interested in more options for your Bathroom? Our Best Quite Flush Toilet Review is another helpful resource.


How can I make my low flow toilet flush better?

Is your toilet having an issue with flushing the bowl well? Leaving smudges on the bowl surfaces making you wait to flush again to have it clean?

This could make it challenging to have a clean toilet and wastewater as you have to flush more than once to have a clean bowl.

There are certain things you could adapt to make your low flow toilet flush better, letting you improve on the flushing of the whole toilet.

First: check whether your toilet may be clogged. This could be done simply by pouring a bucket into your toilet bowl and flushing it.

A clogged toilet would not flush. Have the clogged toilet unclogged with the use of a plunger or a snake. Proceed to do the experiment again to check whether you have unclogged your toilet.

Second: Lift the tank cover. Inspect the water level in the tank to check whether the water is at the required level.

In the case where your water level is not in the right position, make use of the tank float assembly which is found in your toilet tank to have the water adjusted accordingly.

Third: around the rim of your toilet bowl, there are flush holes located, have them checked. Some of the flush holes may be clogged making the water into the bowl low in concentration leading to a decrease in pressure.

Make use of a small drill bit or a coat hanger and push it through the holes to clear any blockage that may be present. Proceed to flush to see if there is an improvement in the water pressure.

Fourth: make use of bleach to have your toilet cleaned. First, proceed to have your water supply to the tank switched off on the water supply valve.

Switch off the valve to have the water completely stopped from supplying water. Pour half a liter of bleach to your toilet bowl and let it sit for 20 minutes at the most.

After 20 minutes, proceed to flush the toilet allowing the bleach to work through the toilet system cleaning out the blockage.

This will see the cleaning of your toilet getting rid of all the blockages and reducing the inefficiency of your low flush toilet.

Fifth: the easiest of them all is to have your toilet soaked in vinegar to improve on the flush power of your toilet. Have the lid to your toilet tank opened, removing carefully the fill hose at the top of the overflow tube.

Using a funnel pour a quart of vinegar into the tube. Let the vinegar sit for a minimum of two hours.

This will help with the disinfection and the relieving of the deposits that build up with time your toilet system.

The five steps above will help with the improvement of your flushing power of your toilet n the overall and should be repeated when you are having an issue with your toilet.

In the case where the steps may not work or be effective, you may consider having your toilet replaced.

What does 1.6gpf toilet mean?

1.6gpf toilet simply means the consumption per flush by the particular toilet stands at 1.6 gallons in a single flush.

Toilets are referred in regard to the consumption of water in a single flush to make you aware of how much the toilet will consume when you flush.

Different toilets have different consumption with each working on their efficiency to ensure the toilet bowl is exceptionally clean.

Is a one-piece toilet better than a two-piece toilet?

Toilets offer different features from the shape, color, and size. When deciding on the toilet that will serve you perfectly you need to decide on whether the toilet you are going for is either a one-piece toilet or a two-piece toilet.

A clear understanding of how they function will assist you in making the decision.

Each water closet is made of 3 crucial parts which are the tank, bowl, and pedestal.

The pedestal takes note of the height being optimal, while the tank caters for the water storage that is essential for flushing power to maintain the cleanliness of the bowl.

The bowl not only collects the wastes but sees the waste to the drain line.

The one-piece toilet also the traditional piece, as the bowl and the tank fused with no joints available. The two-piece toilet is constructed in a way the tank and the bowl are separate and would be put together with fittings.

The two toilets are known to function optimally with their performance being on the same level.

The choice you make on the particular toilet you go for will entirely be dependent on the budget, personal preferences, and individual needs.

Below are some of the facts you should have of each particular toilet.

Performance & Functionality

The functionality and performance of these two toilets do not differ in any way. These two toilets offer similar efficiency and power with the functionality of the two toilets being dependent on the design and the flushing mechanism.

This is expected as most of the interior parts are identical and manufactured by the same company.

You may be in favor of the water-saving or the comfort in height; these could be found in either of the pieces without compromise on its functionality and performance.

Ease of Installation

The installation process of each toilet has its benefits and its drawbacks. The installation is similar for both of the toilets but t tales less time to have a one-piece toilet installed.

Despite this fact, it may be challenging getting it in the right position. Having a one-piece in the right position may need a lot of practice and effort if you choose to do it by yourself.

The benefit of having a two-piece toilet installed is that you will be moving two light-weight pieces, unlike the one-piece toilet. This makes it easier to carry the toilet around and to fix it in the right position.

You ought to have in mind that a two-piece toilet will need a second installation process as you will need to have the two pieces functioning as a unit. Be careful not to break the porcela

in tank in a 2-piece toilet.

Ease of Cleaning

The need to have a clean toilet with low effort and minimal maintenance is something we all seek.

This pushes people to go for the one-piece toilet as it gives an easier time to clean as there are no joints between the bowl and the tank.

A one-piece toilet has a skirted bowl with a flat exterior surface.

This molded design translates to no grooves in between thus less space for grime to settle in. this sees the prevention of growth and spread of bacteria.

This makes a one-piece toilet ore hygienic and thus easy to maintain. The two-piece toilet on the other hand has more hard to reach spaces thus hard to clean. The joint area in a two-piece toilet offers a favorable ground for dirt ad bacteria to grow and settle.

Size & Weight

The two-piece and the one-piece toilet both come in different sizes depending on your preference. The one-piece model is known to consume less space due to the design they adopt.

The molding of the tank and the bowl together makes sure the space taken up is less.

The most common feature on the one-piece toilet offer are the comfortable height with the bowl sitting at 17”. The one-piece toilets are known to be heavier as it is molded into one piece.

On the other hand, the two-piece toilets will give you a comfortable and the standard height of your toilet making it suitable for all bathrooms available.

When in search of a toile be sure to take note of the rough-in, which refers to the distance between the walls behind your toilet to the center of the drain pipe.

The common measurement is 12” rough-in but there are other measurements of 10” to 14”.

The two-piece toilets are known to have more options available regarding the rough-in as they are designed differently to fit different types of bathrooms.

The double piece is known to weigh less as you can separate the bowl from the tank, making it easy to move it around when fixing it.

The Durability

The feature of the single-piece toilet where there is no need to join the part of the toilet thus easy maintenance. This makes the single piece toilet more durable, reliable, and tougher and you will not worry about leakages.

The double piece toilet will need extra care as the bowl and the tank may crack over time. With the breakage of one of the two, you will need to replace one or both of them at some point.

Another issue is the rubber gasket in the double piece toilet which tends to wear out after a period leading to leaks.

Both toilets could last long enough when taken care of in the right way without the need for a replacement.

Aesthetic Look

The double and single-piece toilets offer a wide range of shapes and styles to choose from.

Most individuals go for the single-piece toilet as it is more stylish, its continuous and seamless design with no joints and gaps in between gives it a more stylish look.

It adds a luxury appearance to your bathroom with the skirted bowl giving it a contemporary look.

Advantages of the one-piece Toilet


  • With flushing options, saving on water.
  • Durability and less susceptible to breakages.
  • Smaller sized and compact.
  • Easy and fast installation.
  • Easy to clean options.
  • A Sleek design.
  • A comfortable height to sit.
  • Stylish and unique design.


  • t is heavy.
  • The rough-in options are few.
  • More pricey.

Advantages of the Two-Piece Toilets


  • The rough and height options are many.
  • The bowl or the tank can be replaced separately.
  • Easy to ship across states.
  • They are cheaper compared to the one-piece toilets.
  • Easy installation process.
  • The style compliments different ideas of your bathroom.


  • More susceptible to breakages and leaks.
  • Difficulty in cleaning and maintaining.
  • The installation is time-consuming.
  • Its height would not work with short individual.

How much water does a low flow toilet use

The toilets invented in the 1980s saw the consumption of water u to 3.5 gallons in a single flush.

This was an improvement from the original toilets which saw consumption of up to 5 to 7 gallons in a single flush.

Taking into consideration where the average person flushes 5 times in a single day this will see a high consumption of water to be particular in a household with several individuals.

Gradually there has been an improvement on every toilet that was manufactured since 1994 with a consumption of 1.6 gallons per flush with a newer version seeing consumption of 1.28 gallons per flush.

At the beginning, these models received back lush for not performing exceptionally as the earlier model, but with time the low-flush toilet improved with the inclusion of new technologies.

A household with several individuals will save several thousand gallons in a year with the simple switch to a low-flush toilet.

What does a concealed trap way mean?

A lot of people are going for toilets that offer the needed aesthetic in their bathroom. They all end up looking at the concealed trapway toilets which could be vividly explained.

The toilets with concealed trapway offer an integrated, skirted base that provides a cleaner and sleeker aesthetic. dual flush toilet

The concealed trapway toilets fit perfectly in homes gong for seamless design elements in the home, with time the toilet designs are getting more contemporary, simpler, and sleeker.

Concealed trapway toilets are time-consuming in the engineering work and the details on the toilet, making it more costly compared to the standard toilet.

In case you are in search of style and design, this toilet will be the right one to go for.

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